syntax: Pretty print impls with new syntax

Author: brson

src/libsyntax/print/pprust.rs

@@ -496,19 +496,20 @@ fn print_item(s: ps, &&item: @ast::item) {
       }
       ast::item_impl(tps, traits, ty, methods) => {
         head(s, ~"impl");
-        word(s.s, *item.ident);
-        print_type_params(s, tps);
-        space(s.s);
+        if tps.is_not_empty() {
+            print_type_params(s, tps);
+            space(s.s);
+        }
+        print_type(s, ty);
+
         if vec::len(traits) != 0u {
-            word_nbsp(s, ~"of");
+            word_space(s, ~":");
             do commasep(s, inconsistent, traits) |s, p| {
                 print_path(s, p.path, false);
             }
-            space(s.s);
         }
-        word_nbsp(s, ~"for");
-        print_type(s, ty);
         space(s.s);
+
         bopen(s);
         for methods.each |meth| {
            print_method(s, meth);